brtn692

im having problems with my truck. it has a constant miss and bad loss of power. the muffler and pipe was missing for about 2 years. im not very good with vehicles or how to fix them but i was wondering if anyone here would know what is happening and how i could fix it

Bert

Take it to Autozone and they'll pull codes for free.

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Bert

timshamrock

You most likely have a coil on plug dead which the trend will be even more will die soon. I had the experience of finding which one was dead by unplugging each one at a time while watching a vacuum gauge at idle. I replaced the coil but within a week had another fail.
Autozone will read your codes for free but the issue is the coil on plugs might not register. It's common to have a failed COP (coil on plug) with no issues at the computer until the emissions fails with hydrocarbons or the O2 sensor fails.
Replace all eight of the COPs and the plugs at the same time. You'll be more confident that the issue will be elsewhere and the codes will let you know.
You can buy a complete set of COPs for around $200 (Accel kit from O'Reillys) and the plugs will run anywhere from $4 to $15 each depending on what you select. I went with Bosch Platinum 4s just for reliability AND the auto store didn't have OEM Motorcrafts in stock. You don't need anything 'racing' for spark plugs or COPs and the only reason for Accel's COPs were the cost, OEM will cost you around $40 per coil. Don't forget to use dielectric grease on all the connections when you reassemble or that moisture could find you back in jeopardy again. Good luck!

kevinbell

Ford F-150 4x4 5.4L Noticed a miss during acceleration 1/2 to 3/4 throttle. Dealership has looked into it 3 times; says no miss. I drove with the tech and his computer noted a miss with cyl 2. The problem is much worse when the engine is cold. They've had my truck for days and can't fix it. What could it be?
Dealer swapped coil pack #2 with #1 to see if the problem follows the coil pack. Going to return it to the dealer this week for more troubleshooting.